Piezoimpedane and pressure sensors with NiZn ferrite device

✍ Scribed by N. Zhang; Z.L. Wang; X. Fang

• Book ID: 104092523
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 408 KB
• Volume: 147
• Category: Article
• ISSN: 0924-4247
• DOI: 10.1016/j.sna.2008.06.012

✦ Synopsis

The hydrostatic pressure effect on the magnetism, capacitance and impedance of a NiZn ferrite device has been investigated. Giant piezomagnetism, piezocapacitance and piezoimpedane independent on skin effect have been observed simultaneously under a pressure of several MPa. With increasing the frequency of the current applied across the ferrite device, the piezoimpedane has been found to undergo a maximum at a current frequency of 500 Hz. Under a pressure of 6 MPa, the maximum of piezoimpedane can reach about 71%. And the pressure sensitivity of the impedance can be higher than 0.18 MPa -1 when the pressure is lower than 3 MPa. Analysis shows that these giant pressure effects in the ferrite device result from the variation of the inner stress in the ferrite under an external pressure.